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CHICAGO, IL - DECEMBER 09: Police stand guard in front of the Chicago Board of Trade building during a demonstration on December 9, 2015 in Chicago, Illinois. About 1,000 protestors calling for the resignation of Chicago Mayor Rahm Emanuel marched through downtown blocking traffic and occasionally having brief clashes with police. Emanuel has come under fire as allegations of extreme misconduct in the Chicago Police Department continue to surface and many people have accused the mayor of trying to cover it up. (Photo by Scott Olson/Getty Images)